<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>电子时钟</title>
  <style>
    div{
      display:inline-block;
      padding: 20px 40px;
      border:solid 1px #789;
    }
  </style>
</head>
<body>
  <div></div>
  <script src="./build/js/bundle.js"></script>
</body>
</html>